Well frankly with all things its how you manage it.
For example the arc of season two wasn't killing Azazel but in Sam not losing himself.
One is the confrontation with (at the time) the biggest bad they knew, and the one that had such a dramatic impact on their entire life but the real focus on the full season was Sam staying true to himself and when giving the chance not to kill Jake.
Thats a rather small thing for the show, but for the character thats huge.
Of course, Dean had to go fuck that up...
So yeah trying to top Lucifer probably not the best thing as really their is only one real main stream supernatural being then lucifer, and I don't think they have the balls to go after God.
But I can certainly see the merit int he characters having to deal with their actions in stopping Heaven and Hell, both good and bad. And how all that they have gone through and lost both internally and externally could have a lot of dramatic possibility.
I dont know if the writers have the skills to attempt that though, I do think the actors have proven they can get inside the heads of their two characters.
For example the arc of season two wasn't killing Azazel but in Sam not losing himself.
One is the confrontation with (at the time) the biggest bad they knew, and the one that had such a dramatic impact on their entire life but the real focus on the full season was Sam staying true to himself and when giving the chance not to kill Jake.
Thats a rather small thing for the show, but for the character thats huge.
Of course, Dean had to go fuck that up...
So yeah trying to top Lucifer probably not the best thing as really their is only one real main stream supernatural being then lucifer, and I don't think they have the balls to go after God.
But I can certainly see the merit int he characters having to deal with their actions in stopping Heaven and Hell, both good and bad. And how all that they have gone through and lost both internally and externally could have a lot of dramatic possibility.
I dont know if the writers have the skills to attempt that though, I do think the actors have proven they can get inside the heads of their two characters.